-- # server
function headshot(player, weapon)
    killPed(source, player, weapon, 9)
    local killingSpreee = getElementData(player, "killingSpree") + 1
    if(killingSpreee ~= 2) and (killingSpreee ~= 4) and (killingSpreee ~= 5) then
        triggerClientEvent(player, "sound", player, "sounds/headshot.mp3", 0.5)
    end
end
addEvent("headshot", true)
addEventHandler("headshot", root, headshot)

function onPlayerWasted(killer)
  if(getElementData(killer, "killingSpree") + 1 == 2) then
   triggerClientEvent(killer, "sound", killer, "sounds/double_kill.mp3", 0.5)
  elseif(getElementData(killer, "killingSpree") + 1 == 4) then
   triggerClientEvent(killer, "sound", killer, "sounds/multi_kill.mp3", 0.5)
  elseif(getElementData(killer, "killingSpree") + 1 == 5) then
   triggerClientEvent(killer, "sound", killer, "sounds/monster_kill.mp3", 0.5)
  end
end
addEventHandler("onPlayerWasted", root, onPlayerWasted)

-- # client
function onPlayerDamage(attacker, weapon, bodypart)
    if (attacker == getLocalPlayer()) and (bodypart == 9) then
        triggerServerEvent("headshot", source, attacker, weapon)
    end
end
addEventHandler ("onClientPlayerDamage", getRootElement(), onPlayerDamage)

function sound(path, volume)
   local s = playSound(path)
   setSoundVolume(s, volume)
end
addEvent("sound", true)
addEventHandler("sound", getLocalPlayer(), sound)